Frost line depth in Brooke County, WV
How deep the ground freezes in Brooke County, WV
23 in. Dig to 23 in, just below the frost. Nearest NOAA station: Wheeling Ohio Co Ap, 7.6 mi.
Your building department sets the legal frost line depth (IRC Table R301.2(1)); footings must go below it (R403.1.4.1). Call them before you dig.